I have had NINE calls from this number beginning 24SEP2020 up to yesterday 12OCT2020. I've always let the calls ring out as my phone reports it as "Potential Fraud". The calls are ALWAYS in the evenings varying from the earliest 18:06 to as late as 20:47 at night.
As there weren't any results recorded here I thought I'd try calling the number back and received an automated "Optus advises that the mobile number you are ringing has been disconnected."
I'm going to block the number.